Add developer instructions

[andrewwinters5000]

This also adds a NEWS.md and change log to the docs for future clarity.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.81%. Comparing base (728fb2e) to head (9bc8b34).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #93   +/-   ##
=======================================
  Coverage   98.81%   98.81%           
=======================================
  Files          21       21           
  Lines        1863     1863           
=======================================
  Hits         1841     1841           
  Misses         22       22           

Flag	Coverage Δ
unittests	98.81% <ø> (ø)

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[coveralls]

coverage: 98.819%. remained the same
when pulling 9bc8b34 on dev-instructions
into 728fb2e on main.

[ranocha]

Thanks